How much does it cost to have a green roof installed?
Installing a green roof costs on average between €45 and €150 per m², depending on the type of vegetation and the structure of the system. A green roof is a roof covered with vegetation, ranging from sedum (succulents) to a full roof garden with shrubs and trees. The costs for a sedum roof are the lowest, while intensive roof gardens are at the top of the price spectrum. In this price guide, you can read about the costs of the various options and what to look out for during installation.
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How much does a green roof cost?
Installing a green roof costs on average between €45 and €150 per m², depending on the type of system you choose. The costs for a sedum roof are in the middle segment at €70 to €100 per m², while a full roof garden is at the top of the price spectrum. Costs are always calculated per square metre and are project costs including materials and labour.
Green roof costs per type
Type of roof | Costs per m² | Average lifespan |
|---|---|---|
PVC | €45 to €90 | 25 years |
EPDM | €50 to €100 | 40 years |
Sedum roof | €70 to €100 | 60 years |
Roof garden | €130 to €150 | 60 years |
The table shows that initial costs vary greatly, but a sedum roof or roof garden has a much longer lifespan than traditional roofing. When installing a sedum roof, you are not only getting a green roof but also an investment that lasts for decades.
If the roof construction is unsuitable, additional costs for a new roof will be €90 to €150 per m². The affiliated professionals always first check whether your roof can handle the extra weight of a green roof. Fortunately, subsidies are often available. Many municipalities offer up to €40 per m² subsidy for green roofs. Check with your own municipality for the current conditions.
All mentioned costs include 21% VAT and labour.
Green roof costs per type
The costs for a green roof vary greatly per type. A sedum roof (extensive green roof) is lighter, requires minimal maintenance, and needs a load-bearing capacity of 60-150 kg/m². A roof garden (intensive green roof) offers a full garden experience but is heavier and requires 150-500 kg/m² load-bearing capacity. The cheapest scenario is a sedum roof on existing roofing (€70 to €100 per m²), the most expensive is a roof garden with new roofing and structural reinforcement.
Type of roof | Costs per m² |
|---|---|
Sedum roof (extensive) | €70 to €100 |
Roof garden (intensive) | €130 to €150 |
As a base layer for a green roof, you need root-resistant roofing. Bitumen is not suitable, so when replacing it, you choose PVC or EPDM:
Type of roofing | Costs per m² |
|---|---|
PVC | €45 to €90 |
EPDM | €50 to €100 |
Price-determining factors for a green roof
The costs for a green roof vary per project. Below you can read which factors influence the total price and what you can do to prevent unnecessary costs.
Quality of current roof
The load-bearing capacity of your roof determines whether you can start immediately or first need reinforcement work. A sedum roof requires 60-150 kg/m² load-bearing capacity, a roof garden 150-500 kg/m². If the construction is insufficient, it must be reinforced or replaced. This means an extra €90 to €150 per m² before you even get to the vegetation layer.
Type of roofing
Bitumen is not root-resistant and therefore unsuitable as a base layer. For a bitumen roof, a new base layer of PVC (€45 to €90 per m²) or EPDM (€50 to €100 per m²) must first be applied before you can install a green roof. This doubles the material costs and significantly increases the labour time.
Type of green roof
A sedum roof is cheaper and lighter than a roof garden. Sedum requires minimal maintenance and needs a thinner substrate layer. A roof garden requires a heavier construction, more load-bearing capacity, a deeper soil layer, and more expensive planting such as shrubs or even small trees. This difference explains why the costs for a sedum roof (€70 to €100 per m²) are lower than those of a roof garden (€130 to €150).
Number of square metres
The larger the roof surface, the higher the total costs. With double layers (new roofing plus vegetation), costs increase further because both tasks must be fully performed. A 50 m² project costs less than a 150 m² project, but the price per m² remains comparable.
Incline angle
A flat roof is ideal for installing a green roof. From a 35-degree incline, additional anchoring material is needed to keep the substrate and vegetation in place. This increases material costs and installation time. Above 60 degrees, a green roof is not possible due to the risk of sliding.
Urgency versus planned
Urgent jobs are more expensive than planned work because the professional must adjust their schedule. When installing a sedum roof, there is rarely real urgency, but replacing damaged roofing sometimes cannot wait. Keep this in mind during your budgeting.
Weekend versus weekdays
Work at the weekend costs more than during the week. Therefore, preferably plan your project on a weekday to keep labour costs low.
Region
In large cities, costs are often higher than in rural areas. This is due to higher wage costs, parking costs, and the accessibility of the workplace. Price differences can reach 15-20% between a city centre and a rural environment.
Permits
For structural changes, monumental buildings, or protected cityscapes, an environmental permit may be required. This means extra time and costs for the application and inspection. Check beforehand with your municipality if you need a permit.
Combination with solar panels
A green roof can be combined with solar panels. The cooling effect of the vegetation increases the efficiency of the panels but requires adapted mounting and extra load-bearing calculations. This increases installation costs but offers long-term benefits.
Good preparation and accessibility
Ensure the workplace is clear and accessible. This shortens labour time and keeps costs low. Remove old materials, clean the roof, and ensure free access.
Choose a local professional
Local professionals can be on-site faster and do not have to charge high travel costs. Via Zoofy, you know what you pay in advance, without call-out charges and without surprises.
Additional costs and surcharges
Additional costs are project-dependent. At Zoofy, you do not pay call-out charges.
Urgent jobs are more expensive because the professional must adjust their schedule
Weekend work costs more than during the week
Unsuitable roof construction means reinforcement or replacement for €90 to €150 per m²
Bitumen roof requires a new root-resistant base layer: PVC (€45 to €90 per m²) or EPDM (€50 to €100 per m²)
Subsidy can reduce costs by up to €40 per m² — check the conditions with your municipality, water board, or province
How does the professional work when installing a green roof?
Installing a green roof follows a fixed sequence of steps in which the professional assesses the roof construction and then builds it up layer by layer.
Inspection and load-bearing assessment: The professional checks the existing roof construction for load-bearing capacity and may make a structural calculation. For a sedum roof, 60-150 kg/m² capacity is needed, for a roof garden 150-500 kg/m². If the construction is insufficient, reinforcement or replacement is performed first.
Applying waterproof and root-resistant layer: For bitumen roofs, the professional applies a new base layer of PVC or EPDM. This layer is essential for protection against root growth and increases costs by approximately €45 to €100 per m².
Installation of drainage layer: The drainage layer ensures the removal of excess water. A sedum roof can retain 50-70% of rainwater, which prevents water nuisance.
Applying filter layer and substrate: The filter layer stops fine particles. The substrate forms the growth layer for the plants.
Planting vegetation: For a sedum roof, succulents are applied; for a roof garden, shrubs and plants. The best season is spring or early autumn for optimal root formation. Ensure the roof is freely accessible beforehand.
How can you save on a green roof?
There are several ways to keep the costs for a green roof low without compromising on quality.
Have a load-bearing assessment made beforehand: A professional check prevents discovering during installation that structural reinforcement is needed for €90 to €150 per m².
Ensure a clear workplace: Remove obstacles from the roof and make access easily reachable. This shortens labour time and keeps costs low.
Plan on weekdays and well in advance: Weekend work and urgent jobs are more expensive because the professional must adjust their schedule. A weekday appointment saves you directly on labour costs.
Check subsidies: Many municipalities, water boards, and provinces offer up to €40 per m² subsidy for green roofs. This can significantly reduce the total costs.
Book via Zoofy: You get a fixed rate in advance, without call-out charges and without surprises. You only pay after the job is completed.
Common problems with green roofs
Problems with green roofs usually involve the roof construction, water management, or vegetation.
Root growth through protective layer
Plant roots can grow through the root-resistant layer if it is not properly installed or not suitable for the type of vegetation. This causes leaks that require expensive repairs and can result in damage to the roof and the space below it.
Clogged drainage
Leaves, roots, or dirt can clog the drainage layer, leading to water accumulation on the roof. Water that cannot drain properly increases the load on the construction and raises the risk of leaks. This problem can be avoided with regular maintenance.
Insufficient load-bearing capacity
If the load-bearing capacity is not properly calculated before you have a sedum roof installed, cracks or sagging can occur. This happens with an unsuitable roof construction that cannot handle the weight of substrate, vegetation, and water.
Find the best professional for your green roof
A green roof is a significant investment, so choose an experienced professional who knows how the job can best be handled.
Experience with green roofs: Ask about previous projects and references, especially when installing a sedum roof where load-bearing capacity and root resistance are crucial.
Guarantee on work and materials: Check if the professional offers a guarantee on the installation and the materials used.
No call-out charges: At Zoofy, you never pay extra for the professional's arrival, keeping costs predictable.
Fixed price in advance: You know exactly what you pay, without surprises afterwards.
Quick booking without quote hassle: Choose a moment directly without time-consuming quote requests.
Payment via QR code after completion: You only pay when the job is fully finished.
Reliable, verified professionals: All affiliated professionals are verified and rated on average with a 9.2.
Frequently asked questions about green roofs
What does a sedum roof cost per m²?
A sedum roof costs on average €70 to €100 per m², including materials and labour. If you need new roofing or structural reinforcement, an additional €45 to €150 per m² will be added. The costs are predictable and include 21% VAT.
How much maintenance does a green roof need?
A sedum roof requires minimal maintenance: 1 to 2 times per year for inspection and weed removal. A roof garden requires regular maintenance such as pruning, fertilising, and watering. Maintenance is therefore highly dependent on the type of green roof you choose.
Is my roof suitable for a green roof?
That depends on the load-bearing capacity and incline angle. A sedum roof requires 60 to 150 kg/m² capacity, a roof garden 150 to 500 kg/m². Above a 60-degree incline, a green roof is not possible. The affiliated professionals always assess beforehand whether your roof is suitable.
Can I install a green roof myself?
This is discouraged. Installation requires specialist knowledge about load-bearing capacity, waterproofing, and layer structure. Mistakes can lead to leaks and structural damage that turn out to be much more expensive than the costs for professional installation.
How much subsidy do you get for a green roof?
Many municipalities, water boards, and provinces offer subsidies up to €40 per m². The conditions differ per municipality. Check the energy subsidy guide or your own municipality's website for current schemes and application procedures.
What are the disadvantages of green roofing?
The main disadvantages are higher initial costs, extra weight on the construction, and regular maintenance. With insufficient load-bearing capacity, reinforcement work is necessary. However, a green roof lasts 60 years and significantly increases the insulation value.
How many degrees does a green roof save?
A green roof can provide up to 5 degrees of cooling in the summer. The vegetation layer insulates and absorbs heat, which is especially noticeable with intensive roofs with thick substrate layers. This reduces your cooling costs and increases comfort.
Can I combine a green roof with solar panels?
Yes, this is possible and even advantageous. The cooling effect of the vegetation increases the efficiency of the solar panels. The installation does require adapted mounting and extra load-bearing calculations, which increases the costs.
How long does a green roof last?
A sedum roof or roof garden lasts on average 60 years. This is much longer than standard PVC (25 years) or EPDM (40 years). The long lifespan makes the higher initial investment profitable in the long term.
What happens in the event of a leak under a green roof?
Leaks can occur due to root growth or damaged waterproofing. Always have this investigated and repaired by a professional. Ask beforehand about the guarantee on work and materials to protect yourself against future costs.
Book a professional for your green roof
Ready to have a green roof installed? At Zoofy, you can book a professional directly, without quotes and without call-out charges. You will see exactly what it costs in advance, and Zoofy connects you with a reliable professional who has been verified. You only pay when the work is finished.